storage: remove extraneous call to VIR_DIR_CLOSE()

storage: remove extraneous call to VIR_DIR_CLOSE()

VIR_DIR_CLOSE(dir) is called in the middle of
virStorageBackendRefreshLocal(), which is okay, but redundant - there
is no reference to dir between that call and the end of the function,
where VIR_DIR_CLOSE() is called again. Remove the extra call in the
middle to simplify the function and make the conversion to g_autoptr
trivial/mechanical.

Signed-off-by: Laine Stump <laine@redhat.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>